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<div class="chapter" lang="en">
<div class="titlepage"><div><div><h2 class="title">
<a name="gtk-migrating-GtkColorButton"></a>Migrating from GnomeColorPicker to GtkColorButton</h2></div></div></div>
<p>
    Since version 2.6, GTK+ provides the <a class="link" href="GtkColorButton.html" title="GtkColorButton"><span class="type">GtkColorButton</span></a>
    widget as a replacement for the <span class="structname">GnomeColorPicker</span> 
    widget in the libgnomeui library.
  </p>
<p>
   Porting an application from <span class="structname">GnomeColorPicker</span> to 
   <span class="structname">GtkColorButton</span> is very simple. 
   <span class="structname">GtkColorButton</span> doesn't support dithering 
   (since it is rarely needed on modern hardware), and it doesn't have 
   setters and getters to set the color from floating point or integer 
    components. So instead of
   </p>
<div class="informalexample"><pre class="programlisting">
   guint red, green, blue, alpha;
   /* ... */
   gnome_color_picker_set_i8 (color_picker, red, green, blue, alpha);
   </pre></div>
<p>   
   you have to write
   </p>
<div class="informalexample"><pre class="programlisting">
   GdkColor color;

   color.red = red &lt;&lt; 8;
   color.green = green &lt;&lt; 8;
   color.blue = blue &lt;&lt; 8;
   gtk_color_button_set_color (color_picker, &amp;color);
   gtk_color_button_set_alpha (color_picker, alpha &lt;&lt; 8);
   </pre></div>
<p>   
  and similarly for the setters taking other number formats. For 
  <code class="function"><a
href="/usr/share/gtk-doc/html/libgnomeui/GnomeColorPicker.html#gnome-color-picker-set-i16"
><code class="function">gnome_color_picker_set_i16()</code></a></code> no conversion is needed, 
  for <code class="function"><a
href="/usr/share/gtk-doc/html/libgnomeui/GnomeColorPicker.html#gnome-color-picker-set-d"
><code class="function">gnome_color_picker_set_d()</code></a></code>, you need to convert 
  the color components like this:
   </p>
<div class="informalexample"><pre class="programlisting">  
   color.red = (guint16) (red * 65535.0 + 0.5);
   color.green = (guint16) (green * 65535.0 + 0.5);
   color.blue = (guint16) (blue * 65535.0 + 0.5);
   </pre></div>
<p>   
  </p>
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